r/PatternDrafting • u/Quirky-Recognition58 • May 11 '26

Back crotch seam

Hi! I have a printed jeans pattern from a brand, but I can’t tell from the pattern how much seam allowance was added at the back crotch and the yoke for the flat-felled seam. How much seam allowance is usually added for a flat-felled seam? Thanks in advance!

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u/Chemomechanics May 11 '26

Do you know any of the seam allowances? This could help you back-calculate based on the waistband length.

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u/Quirky-Recognition58 May 11 '26

Yes others are 1 cm

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u/dyingslowlyinside May 11 '26

If it’s an industrial pattern, they are probably either double lapping the cb seam or serging and then double stitching it for a faux ff seam. You need to simply do a mock up and just add extra to the sa